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Re: [PATCH] ubifs: Add freeze support

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On Fri, May 26, 2017 at 11:52:42AM +0200, Richard Weinberger wrote:
> Hyunchul,
> 
> Am 26.05.2017 um 01:30 schrieb Hyunchul Lee:
> > From: Hyunchul Lee <cheol.lee@lge.com>
> > 
> > for un/freeze support, implement freeze_super and un/freeze_fs
> > of super_operations.
> > ubifs_freeze_super just calls freeze_super. because freeze_super always
> > succeeds if file system is read-only,  UBIFS errors should be checked.
> > if there are errors, UBIFS is switched to read-only mode.
> > ubifs_freeze_fs runs commit if TNC/LPT isn't clean. though all writes
> > are blocked and sync_fs is called before, if commit alreay was started
> > before writes are blocked, TNC/LPT might have dirty COW nodes.
> 
> you explain how you implement that feature, but not why.
> What is the use-case?
> I always thought this interface is only being used by LVM.

It can also be used through the FIFREEZE ioctl, but without snapshots
underneath the fs it's not all that useful.

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[PATCH] ubifs: Add freeze support Hyunchul Lee <hyc.lee@gmail.com> - 2017-05-26 01:40 +0200
  Re: [PATCH] ubifs: Add freeze support Richard Weinberger <richard@nod.at> - 2017-05-26 12:00 +0200
    Re: [PATCH] ubifs: Add freeze support Christoph Hellwig <hch@infradead.org> - 2017-05-27 10:20 +0200
    Re: [PATCH] ubifs: Add freeze support Hyunchul Lee <hyc.lee@gmail.com> - 2017-05-29 03:20 +0200
      Re: [PATCH] ubifs: Add freeze support Hyunchul Lee <hyc.lee@gmail.com> - 2017-05-29 06:50 +0200
        Re: [PATCH] ubifs: Add freeze support Amir Goldstein <amir73il@gmail.com> - 2017-05-29 07:50 +0200
          Re: [PATCH] ubifs: Add freeze support Richard Weinberger <richard@nod.at> - 2017-05-29 11:10 +0200
            Re: [PATCH] ubifs: Add freeze support Amir Goldstein <amir73il@gmail.com> - 2017-05-29 12:10 +0200
              Re: [PATCH] ubifs: Add freeze support Richard Weinberger <richard@nod.at> - 2017-05-29 12:20 +0200
                Re: [PATCH] ubifs: Add freeze support Amir Goldstein <amir73il@gmail.com> - 2017-05-29 13:50 +0200
  Re: [PATCH] ubifs: Add freeze support Christoph Hellwig <hch@infradead.org> - 2017-05-27 10:30 +0200
    Re: [PATCH] ubifs: Add freeze support Hyunchul Lee <hyc.lee@gmail.com> - 2017-05-29 02:50 +0200
      Re: [PATCH] ubifs: Add freeze support Hyunchul Lee <hyc.lee@gmail.com> - 2017-05-29 04:30 +0200
        Re: [PATCH] ubifs: Add freeze support Richard Weinberger <richard@nod.at> - 2017-05-29 10:50 +0200
          Re: [PATCH] ubifs: Add freeze support Hyunchul Lee <hyc.lee@gmail.com> - 2017-05-30 04:40 +0200
            Re: [PATCH] ubifs: Add freeze support Richard Weinberger <richard@nod.at> - 2017-05-30 10:00 +0200

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